Wheel info. and chart

stickman

This is interesting http://www.casanovasadventures.com/cata ... /p2010.htm

GaryGkn

That was quite interesting.

I noticed that 650B tandem wheels came up on the list.

I am looking for some 40 hole 650b rims mainly because I have a Maxi-Car hub 40 holes do you think it is possible to get 40 hole 650B rims?

I have found some Mavic Module 4 on SJSC for £49.95 but they only have one.

stickman

I don't know myself but on flickr there is a group called '650b Bicycles'

GaryGkn

Cheers I will give them a go.

stickman

Jo,
Here's the chart

GarethPJ

SJS Cycles list a 40 hole Mavic Module 4 at £49.99. Not cheap, but 40 hole rims are getting rare these days.

GaryGkn

Thanks for the heads up.
They seem to be ultra rare.
700c may be a better bet.

GarethPJ

A lot depends on how much clearance you have for the tyre, Assuming you only have clearance for a tyre as the same diameter as your existing tyre then you will need to fit a 622 tyre which is something like 19mm smaller than your existing tyre. So you will probably end up with a pretty skinny tyre.

I used to run 26x1 1/4" (ISO 597) and when the front rim went I changed to 700x23c. 25mm was dangerously close to the guards, and I didn't want to lose the guards. Those tyres had far to little volume to be comfortable.

I did try 559 rims but the brake drop was way to much to cope with. Maybe you could get away with that with your frame. Depends what your current brake drop is, but you'd be adding half an inch to it with 559 rims.

The advantage being that 559 is a popular size for tandems these days, so 40 hole rims may be available at a reasonable price.

GarethPJ

Just found out you can get the Sun CR-18 in a 40 hole 590 size. Should be under £30 each and of course a nice Scwalbe Marathon to suit.

mz__jo

I am fairly certain that the Rigida rims made for the Confrerie du 650B are available in 40 hole specially for all those who have tandems in this size. I will post the link for the Confrerie. You would have to order through a cycle shop; I think that Gilles Berthoud may have them available on mail order although I don't know if he does overseas, France is a bit backward (he undoubtedly would if you crossed his palm with folding stuff). I will dig out the links and post them later this evening. Unfortunately the exchange rate is no longer in your favour.
Cheers Jo
PS they are nice rims, I have them on my tandem, only in 36 hole.

mz__jo

I have looked and Gilles Berthoud has only 650B in 36 hole (the latest Rigida ZAC19 which has replaced the Sphinx model that I have).
For those who can read french the following link may be interesting. You will notice that the Sun rim does not get a universal thumbs up and that it pays to be in the USA or Australia if you want a choice of the interesting stuff.

http://www.confreriedes650.org/jantes.php

http://www.confreriedes650.org/

Sorry I can't be of more help than this, you will have to search for a supplier of the american stuff.

Cheers Jo

mz__jo

It has occurred to me that the easiest solution might be to do the opposite to me and use 26 x 1 3/8 wheels. The difference is 3mm on the radius; aesthetically they are very difficult to tell apart and I doubt that the extra on the diameter would cause a problem with a rim brake (which I assume you have at both ends to go with the drum at the back). I had problems because I was fitting to a tandem that was not meant to have a conventional stirrup brake in the first place.
26 x1 3/8 is a cycle speedway dimension and I imagine that they probably use 40h wheels. Just check that any rim is capable of taking a rim brake. Look at the post on 26 x 1 3/8 cyclo-cross tyres in this forum for some useful links.
Cheers Jo

stickman

This chart would be great permanently at the top of the page.